====== Test points ======

The Gamepad's motherboard features many test points.

{{:drc_01.bottom.jpg?500|}}
{{:drc-20_bottom.jpg?500|}}

TODO: make a picture with the test points labelled, maybe interactive

The following test points have been identified so far:

^ Test point ^ Description ^
| TP3        | Right speaker + |
| TP4        | Right speaker - |
| TP5        | ?? |
| TP6        | ?? |
| TP7        | Left speaker + |
| TP8        | Left speaker - |
| TP15       | ?? |
| TP17       | ?? |
| TP28       | DRC I2C - SDA |
| TP29       | DRC I2C - SCL |
| TP32       | LCD pin 10 |
| TP36       | SPI - MISO |
| TP37       | SPI - MOSI |
| TP38       | SPI - CLK |
| TP39       | SPI - UIC CS |
| TP40       | SPI - FLASH CS |
| TP41       | UIC I2C - SDA |
| TP42       | UIC I2C - SCL |
| TP43       | Reset for DRC and SPI FLASH (simple reset circuit) |
| TP44       | Expansion sense line |
| TP48       | UIC pin 62 |
| TP49       | ?? |
| TP50       | UIC pin 19 |
| TP51       | ?? |
| TP53       | ?? |
| TP55       | ?? |
| TP57       | UIC pin 63 |
| TP58       | ?? |
| TP59       | ?? |
| TP61       | ?? |
| TP64       | B Button |
| TP65       | X Button |
| TP67       | ?? |
| TP68       | ?? |
| TP70       | A Button |
| TP71       | Y Button |
| TP77       | FLASH WP |
| TP79       | ?? |
| TP85       | Power Button (UIC pin 64) |
| TP88       | TSC /PENIRQ |
| TP89       | Headphone jack ground |
| TP96       | UIC SPI - TSC chipselect |
| TP97       | UIC SPI - compass chipselect |
| TP98       | UIC SPI - gyroscope chipselect |
| TP99       | UIC SPI - accelerometer chipselect |
| TP100      | UIC SPI - MISO |
| TP101      | UIC SPI - accelerometer chipselect |
| TP102      | UIC SPI - clock |
| TP103      | L3 |
| TP117      | ?? |
| TP118      | VBUS |
| TP119      | VBUS GND | 
| TP120      | ?? |
| TP121      | VBAT |
| TP122      | ?? |
| TP123      | ?? |
| TP124      | ?? |
| TP125      | GND |
| TP126      | ?? |
| TP127      | ?? |
| TP128      | GND |
| TP129      | ?? |
| TP131      | ?? |
| TP132      | ?? |
| TP133      | ?? |
| TP134      | ?? |
| TP135      | ?? |
| TP136      | ?? |
| TP137      | ?? |
| TP138      | ?? |
| TP139      | ?? |
| TP150      | ?? |
| TP151      | ?? |
| TP152      | POWER Button |
| TP153      | HOME Button |
| TP161      | To Q103 on Sub-Board 1 (LED_B/Power LED..?) | 
| TP162      | LED_R (Low Battery) |
| TP163      | LED_O (Charge) |
| TP164      | TV Button |
| TP200      | LCD pin 29 |
| TP201      | LCD pin 30 |
| TP202      | LCD pin 26 |
| TP203      | LCD pin 27 |
| TP204      | LCD pin 17 |
| TP205      | LCD pin 18 |
| TP206      | LCD pin 21 |
| TP207      | LCD pin 20 |
| TP208      | LCD pin 23 |
| TP209      | LCD pin 24 |
| TP226      | Volume slider |
| TP227      | Vcc (2.8V - SoC, FLASH, ...) |
| TP228      | Vcc (UIC) |
| TP229      | UART boot (to serial header pad 2) |
| TP230      | SoC pad N2 (to ground through R133) |
| TP231      | UART1 TX (to serial header pad 3) |
| TP232      | UART1 RX (to serial header pad 1) |
| TP233      | UIC SWIM |
| TP234      | UIC RST |
| TP235      | GND |
| TP236      | Serial header pad 4 - Vcc (2.8V) |
| TP237      | Serial header pad 2 - UART boot |
| TP238      | Serial header pad 3 - UART1 TX |
| TP239      | Serial header pad 1 - UART1 RX |
| TP500      | ?? |
| TP501      | ?? |

Other points of interest:

^ Marking ^ Description ^
| R4      | Audio amplifier clock input (16 MHz) |
| R6      | Audio amplifier bit clock output (3.08 MHz) |
| R7      | Audio amplifier sample clock output (48 KHz) |
| R8      | Audio amplifier data input (audio output, I2S) |
| R10     | Audio amplifier data output (mic input, I2S?) |

===== Serial header =====

The pins under the battery connector are a serial header connected to [[UART|UART1]].

{{::gamepad_batt_pins2.png?400|}}

^ Pin ^ Description ^
| 1   | RX |
| 2   | UART boot enable (short to ground to enable) |
| 3   | TX |
| 4   | Vcc (2.8V) |